facebook · j-piasecki · Apr 15, 2026 · Apr 15, 2026
diff --git a/packages/react-native/React/Fabric/RCTScheduler.h b/packages/react-native/React/Fabric/RCTScheduler.h
@@ -33,6 +33,8 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (void)schedulerShouldMergeReactRevision:(facebook::react::SurfaceId)surfaceId;
 
+- (BOOL)schedulerShouldPromoteReactRevision:(facebook::react::SurfaceId)surfaceId;
+
 - (void)schedulerDidDispatchCommand:(const facebook::react::ShadowView &)shadowView
                         commandName:(const std::string &)commandName
                                args:(const folly::dynamic &)args;

diff --git a/packages/react-native/React/Fabric/RCTScheduler.mm b/packages/react-native/React/Fabric/RCTScheduler.mm
@@ -43,6 +43,12 @@ void schedulerShouldMergeReactRevision(SurfaceId surfaceId) override
     [scheduler.delegate schedulerShouldMergeReactRevision:surfaceId];
   }
 
+  bool schedulerShouldPromoteReactRevision(SurfaceId surfaceId) override
+  {
+    RCTScheduler *scheduler = (__bridge RCTScheduler *)scheduler_;
+    return [scheduler.delegate schedulerShouldPromoteReactRevision:surfaceId];
+  }
+
   void schedulerDidRequestPreliminaryViewAllocation(const ShadowNode &shadowNode) override
   {
     // Does nothing.

diff --git a/packages/react-native/React/Fabric/RCTSurfacePresenter.mm b/packages/react-native/React/Fabric/RCTSurfacePresenter.mm
@@ -316,6 +316,20 @@ - (void)schedulerShouldMergeReactRevision:(SurfaceId)surfaceId
   });
 }
 
+- (BOOL)schedulerShouldPromoteReactRevision:(SurfaceId)surfaceId
+{
+  if (!RCTIsMainQueue()) {
+    return NO;
+  }
+
+  auto scheduler = [self scheduler];
+  scheduler.uiManager->getShadowTreeRegistry().visit(surfaceId, [](const ShadowTree &shadowTree) {
+    shadowTree.promoteReactRevision();
+    shadowTree.mergeReactRevision();
+  });
+  return YES;
+}
+
 - (void)schedulerDidDispatchCommand:(const ShadowView &)shadowView
                         commandName:(const std::string &)commandName
                                args:(const folly::dynamic &)args

diff --git a/...src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsDefaults.kt b/...src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsDefaults.kt
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<17abc72a4045c5695818f254be1783b5>>
+ * @generated SignedSource<<404892ee783081aa311bb8faa55b231f>>
  */
 
 /**
@@ -67,7 +67,7 @@ public open class ReactNativeFeatureFlagsDefaults : ReactNativeFeatureFlagsProvi
 
   override fun enableExclusivePropsUpdateAndroid(): Boolean = false
 
-  override fun enableFabricCommitBranching(): Boolean = false
+  override fun enableFabricCommitBranching(): Boolean = true
 
   override fun enableFabricLogs(): Boolean = false
 

diff --git a/packages/react-native/ReactAndroid/src/main/jni/react/fabric/FabricMountingManager.h b/packages/react-native/ReactAndroid/src/main/jni/react/fabric/FabricMountingManager.h
@@ -70,9 +70,9 @@ class FabricMountingManager final {
 
   void scheduleReactRevisionMerge(SurfaceId surfaceId);
 
- private:
   bool isOnMainThread();
 
+ private:
   jni::global_ref<JFabricUIManager::javaobject> javaUIManager_;
 
   std::recursive_mutex commitMutex_;

diff --git a/packages/react-native/ReactAndroid/src/main/jni/react/fabric/FabricUIManagerBinding.cpp b/packages/react-native/ReactAndroid/src/main/jni/react/fabric/FabricUIManagerBinding.cpp
@@ -711,6 +711,23 @@ void FabricUIManagerBinding::schedulerShouldMergeReactRevision(
   }
 }
 
+bool FabricUIManagerBinding::schedulerShouldPromoteReactRevision(
+    SurfaceId surfaceId) {
+  std::shared_lock lock(installMutex_);
+  auto mountingManager =
+      getMountingManager("schedulerShouldPromoteReactRevision");
+  if (!mountingManager || !mountingManager->isOnMainThread()) {
+    return false;
+  }
+
+  scheduler_->getUIManager()->getShadowTreeRegistry().visit(
+      surfaceId, [](const ShadowTree& shadowTree) {
+        shadowTree.promoteReactRevision();
+        shadowTree.mergeReactRevision();
+      });
+  return true;
+}
+
 void FabricUIManagerBinding::mergeReactRevision(SurfaceId surfaceId) {
   std::shared_lock lock(installMutex_);
   scheduler_->getUIManager()->getShadowTreeRegistry().visit(

diff --git a/packages/react-native/ReactAndroid/src/main/jni/react/fabric/FabricUIManagerBinding.h b/packages/react-native/ReactAndroid/src/main/jni/react/fabric/FabricUIManagerBinding.h
@@ -99,6 +99,8 @@ class FabricUIManagerBinding : public jni::HybridClass<FabricUIManagerBinding>,
 
   void schedulerShouldMergeReactRevision(SurfaceId surfaceId) override;
 
+  bool schedulerShouldPromoteReactRevision(SurfaceId surfaceId) override;
+
   void mergeReactRevision(SurfaceId surfaceId);
 
   void schedulerDidRequestPreliminaryViewAllocation(const ShadowNode &shadowNode) override;

diff --git a/packages/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlagsDefaults.h b/packages/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlagsDefaults.h
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<33fd238aafa83c5a42803d3f11d55944>>
+ * @generated SignedSource<<c5368d536f9c9b5ee0f6a08d53b51929>>
  */
 
 /**
@@ -116,7 +116,7 @@ class ReactNativeFeatureFlagsDefaults : public ReactNativeFeatureFlagsProvider {
   }
 
   bool enableFabricCommitBranching() override {
-    return false;
+    return true;
   }
 
   bool enableFabricLogs() override {

diff --git a/packages/react-native/ReactCommon/react/renderer/scheduler/Scheduler.cpp b/packages/react-native/ReactCommon/react/renderer/scheduler/Scheduler.cpp
@@ -377,6 +377,15 @@ void Scheduler::uiManagerShouldRemoveEventListener(
 
 void Scheduler::uiManagerDidFinishReactCommit(const ShadowTree& shadowTree) {
   auto surfaceId = shadowTree.getSurfaceId();
+
+  // If the commit is happening on the main thread, it should be merged
+  // immediately instead of being scheduled. This allows for synchronous
+  // events to be handled correctly.
+  if (delegate_ != nullptr &&
+      delegate_->schedulerShouldPromoteReactRevision(surfaceId)) {
+    return;
+  }
+
   runtimeScheduler_->scheduleRenderingUpdate(
       surfaceId, [surfaceId, uiManager = uiManager_]() {
         uiManager->getShadowTreeRegistry().visit(

diff --git a/packages/react-native/ReactCommon/react/renderer/scheduler/SchedulerDelegate.h b/packages/react-native/ReactCommon/react/renderer/scheduler/SchedulerDelegate.h
@@ -44,6 +44,15 @@ class SchedulerDelegate {
    */
   virtual void schedulerShouldMergeReactRevision(SurfaceId surfaceId) = 0;
 
+  /*
+   * Called when a React commit finishes and the JS revision needs to be
+   * promoted. If the platform is currently on the main thread, it should
+   * promote and merge the revision immediately, returning true.
+   * If not on the main thread, it should return false and the caller will
+   * schedule the promotion at the end of the event loop.
+   */
+  virtual bool schedulerShouldPromoteReactRevision(SurfaceId surfaceId) = 0;
+
   /*
    * Called right after a new ShadowNode was created.
    */

diff --git a/packages/react-native/ReactCxxPlatform/react/renderer/scheduler/SchedulerDelegateImpl.cpp b/packages/react-native/ReactCxxPlatform/react/renderer/scheduler/SchedulerDelegateImpl.cpp
@@ -43,6 +43,11 @@ void SchedulerDelegateImpl::schedulerShouldMergeReactRevision(
       [](const ShadowTree& shadowTree) { shadowTree.mergeReactRevision(); });
 }
 
+bool SchedulerDelegateImpl::schedulerShouldPromoteReactRevision(
+    SurfaceId /*surfaceId*/) {
+  return false;
+}
+
 void SchedulerDelegateImpl::schedulerDidRequestPreliminaryViewAllocation(
     const ShadowNode& shadowNode) {}
 

diff --git a/packages/react-native/ReactCxxPlatform/react/renderer/scheduler/SchedulerDelegateImpl.h b/packages/react-native/ReactCxxPlatform/react/renderer/scheduler/SchedulerDelegateImpl.h
@@ -35,6 +35,8 @@ class SchedulerDelegateImpl : public SchedulerDelegate {
 
   void schedulerShouldMergeReactRevision(SurfaceId surfaceId) override;
 
+  bool schedulerShouldPromoteReactRevision(SurfaceId surfaceId) override;
+
   void schedulerDidRequestPreliminaryViewAllocation(const ShadowNode &shadowNode) override;
 
   void schedulerDidDispatchCommand(

diff --git a/packages/react-native/scripts/featureflags/ReactNativeFeatureFlags.config.js b/packages/react-native/scripts/featureflags/ReactNativeFeatureFlags.config.js
@@ -287,7 +287,7 @@ const definitions: FeatureFlagDefinitions = {
       ossReleaseStage: 'none',
     },
     enableFabricCommitBranching: {
-      defaultValue: false,
+      defaultValue: true,
       metadata: {
         description:
           'Enables Fabric commit branching to fix starvation problems and atomic JS updates.',

diff --git a/packages/react-native/src/private/featureflags/ReactNativeFeatureFlags.js b/packages/react-native/src/private/featureflags/ReactNativeFeatureFlags.js
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<1ec2592998e830300fc777070dfdc49d>>
+ * @generated SignedSource<<4e307a9c3ceae21cc7f1e201c58a51ad>>
  * @flow strict
  * @noformat
  */
@@ -287,7 +287,7 @@ export const enableExclusivePropsUpdateAndroid: Getter<boolean> = createNativeFl
 /**
  * Enables Fabric commit branching to fix starvation problems and atomic JS updates.
  */
-export const enableFabricCommitBranching: Getter<boolean> = createNativeFlagGetter('enableFabricCommitBranching', false);
+export const enableFabricCommitBranching: Getter<boolean> = createNativeFlagGetter('enableFabricCommitBranching', true);
 /**
  * This feature flag enables logs for Fabric.
  */

diff --git a/scripts/cxx-api/api-snapshots/ReactAndroidDebugCxx.api b/scripts/cxx-api/api-snapshots/ReactAndroidDebugCxx.api
@@ -1824,15 +1824,17 @@ class facebook::react::BindingsInstallerHolder : public jni::HybridClass<faceboo
   public void installBindings(facebook::jsi::Runtime& runtime, const std::shared_ptr<facebook::react::CallInvoker>& callInvoker);
 }
 
-class facebook::react::BlobCollector : public jni::HybridClass<facebook::react::BlobCollector>, public facebook::jsi::HostObject {
+class facebook::react::BlobCollector : public facebook::jsi::HostObject {
   public BlobCollector(jni::global_ref<jobject> blobModule, std::string blobId);
   public size_t getBlobLength();
-  public static constexpr auto kJavaDescriptor;
-  public static void nativeInstall(jni::alias_ref<jclass>, jni::alias_ref<jobject> blobModule, jlong jsContextNativePointer);
-  public static void registerNatives();
   public ~BlobCollector();
 }
 
+class facebook::react::BlobModuleJSIBindings : public jni::JavaClass<facebook::react::BlobModuleJSIBindings> {
+  public static constexpr char* kJavaDescriptor;
+  public static void registerNatives();
+}
+
 class facebook::react::BridgelessNativeMethodCallInvoker : public facebook::react::NativeMethodCallInvoker {
   public BridgelessNativeMethodCallInvoker(std::shared_ptr<facebook::react::MessageQueueThread> messageQueueThread);
   public virtual void invokeAsync(const std::string& methodName, facebook::react::NativeMethodCallFunc&& func) noexcept override;
@@ -2311,6 +2313,7 @@ class facebook::react::ExecutorDelegate {
 class facebook::react::FabricMountingManager {
   public FabricMountingManager(const facebook::react::FabricMountingManager&) = delete;
   public FabricMountingManager(jni::global_ref<JFabricUIManager::javaobject>& javaUIManager);
+  public bool isOnMainThread();
   public bool isViewAllocated(facebook::react::SurfaceId surfaceId, facebook::react::Tag tag);
   public void destroyUnmountedShadowNode(const facebook::react::ShadowNodeFamily& family);
   public void dispatchCommand(const facebook::react::ShadowView& shadowView, const std::string& commandName, const folly::dynamic& args);
@@ -4477,6 +4480,7 @@ class facebook::react::Scheduler : public facebook::react::UIManagerDelegate {
 }
 
 class facebook::react::SchedulerDelegate {
+  public virtual bool schedulerShouldPromoteReactRevision(facebook::react::SurfaceId surfaceId) = 0;
   public virtual void schedulerDidDispatchCommand(const facebook::react::ShadowView& shadowView, const std::string& commandName, const folly::dynamic& args) = 0;
   public virtual void schedulerDidFinishTransaction(const std::shared_ptr<const facebook::react::MountingCoordinator>& mountingCoordinator) = 0;
   public virtual void schedulerDidRequestPreliminaryViewAllocation(const facebook::react::ShadowNode& shadowNode) = 0;
@@ -7440,7 +7444,7 @@ struct facebook::react::NativePerformanceEntry {
 }
 
 struct facebook::react::PerformanceEntrySorter {
-  public bool operator()(const facebook::react::PerformanceEntry& lhs, const facebook::react::PerformanceEntry& rhs);
+  public bool operator()(const facebook::react::PerformanceEntry& lhs, const facebook::react::PerformanceEntry& rhs) const;
 }
 
 struct facebook::react::PerformanceEventTiming : public facebook::react::AbstractPerformanceEntry {

diff --git a/scripts/cxx-api/api-snapshots/ReactAndroidReleaseCxx.api b/scripts/cxx-api/api-snapshots/ReactAndroidReleaseCxx.api
@@ -1822,15 +1822,17 @@ class facebook::react::BindingsInstallerHolder : public jni::HybridClass<faceboo
   public void installBindings(facebook::jsi::Runtime& runtime, const std::shared_ptr<facebook::react::CallInvoker>& callInvoker);
 }
 
-class facebook::react::BlobCollector : public jni::HybridClass<facebook::react::BlobCollector>, public facebook::jsi::HostObject {
+class facebook::react::BlobCollector : public facebook::jsi::HostObject {
   public BlobCollector(jni::global_ref<jobject> blobModule, std::string blobId);
   public size_t getBlobLength();
-  public static constexpr auto kJavaDescriptor;
-  public static void nativeInstall(jni::alias_ref<jclass>, jni::alias_ref<jobject> blobModule, jlong jsContextNativePointer);
-  public static void registerNatives();
   public ~BlobCollector();
 }
 
+class facebook::react::BlobModuleJSIBindings : public jni::JavaClass<facebook::react::BlobModuleJSIBindings> {
+  public static constexpr char* kJavaDescriptor;
+  public static void registerNatives();
+}
+
 class facebook::react::BridgelessNativeMethodCallInvoker : public facebook::react::NativeMethodCallInvoker {
   public BridgelessNativeMethodCallInvoker(std::shared_ptr<facebook::react::MessageQueueThread> messageQueueThread);
   public virtual void invokeAsync(const std::string& methodName, facebook::react::NativeMethodCallFunc&& func) noexcept override;
@@ -2309,6 +2311,7 @@ class facebook::react::ExecutorDelegate {
 class facebook::react::FabricMountingManager {
   public FabricMountingManager(const facebook::react::FabricMountingManager&) = delete;
   public FabricMountingManager(jni::global_ref<JFabricUIManager::javaobject>& javaUIManager);
+  public bool isOnMainThread();
   public bool isViewAllocated(facebook::react::SurfaceId surfaceId, facebook::react::Tag tag);
   public void destroyUnmountedShadowNode(const facebook::react::ShadowNodeFamily& family);
   public void dispatchCommand(const facebook::react::ShadowView& shadowView, const std::string& commandName, const folly::dynamic& args);
@@ -4474,6 +4477,7 @@ class facebook::react::Scheduler : public facebook::react::UIManagerDelegate {
 }
 
 class facebook::react::SchedulerDelegate {
+  public virtual bool schedulerShouldPromoteReactRevision(facebook::react::SurfaceId surfaceId) = 0;
   public virtual void schedulerDidDispatchCommand(const facebook::react::ShadowView& shadowView, const std::string& commandName, const folly::dynamic& args) = 0;
   public virtual void schedulerDidFinishTransaction(const std::shared_ptr<const facebook::react::MountingCoordinator>& mountingCoordinator) = 0;
   public virtual void schedulerDidRequestPreliminaryViewAllocation(const facebook::react::ShadowNode& shadowNode) = 0;
@@ -7431,7 +7435,7 @@ struct facebook::react::NativePerformanceEntry {
 }
 
 struct facebook::react::PerformanceEntrySorter {
-  public bool operator()(const facebook::react::PerformanceEntry& lhs, const facebook::react::PerformanceEntry& rhs);
+  public bool operator()(const facebook::react::PerformanceEntry& lhs, const facebook::react::PerformanceEntry& rhs) const;
 }
 
 struct facebook::react::PerformanceEventTiming : public facebook::react::AbstractPerformanceEntry {

diff --git a/scripts/cxx-api/api-snapshots/ReactAppleDebugCxx.api b/scripts/cxx-api/api-snapshots/ReactAppleDebugCxx.api
@@ -3349,6 +3349,7 @@ protocol RCTSafeAreaViewViewProtocol : public NSObject {
 }
 
 protocol RCTSchedulerDelegate {
+  public virtual BOOL schedulerShouldPromoteReactRevision:(facebook::react::SurfaceId surfaceId);
   public virtual void schedulerDidDispatchCommand:commandName:args:(const facebook::react::ShadowView& shadowView, const std::string& commandName, const folly::dynamic& args);
   public virtual void schedulerDidFinishTransaction:(std::shared_ptr<const facebook::react::MountingCoordinator> mountingCoordinator);
   public virtual void schedulerDidSendAccessibilityEvent:eventType:(const facebook::react::ShadowView& shadowView, const std::string& eventType);
@@ -7064,6 +7065,7 @@ class facebook::react::Scheduler : public facebook::react::UIManagerDelegate {
 }
 
 class facebook::react::SchedulerDelegate {
+  public virtual bool schedulerShouldPromoteReactRevision(facebook::react::SurfaceId surfaceId) = 0;
   public virtual void schedulerDidDispatchCommand(const facebook::react::ShadowView& shadowView, const std::string& commandName, const folly::dynamic& args) = 0;
   public virtual void schedulerDidFinishTransaction(const std::shared_ptr<const facebook::react::MountingCoordinator>& mountingCoordinator) = 0;
   public virtual void schedulerDidRequestPreliminaryViewAllocation(const facebook::react::ShadowNode& shadowNode) = 0;
@@ -9891,7 +9893,7 @@ struct facebook::react::NativePerformanceEntry {
 }
 
 struct facebook::react::PerformanceEntrySorter {
-  public bool operator()(const facebook::react::PerformanceEntry& lhs, const facebook::react::PerformanceEntry& rhs);
+  public bool operator()(const facebook::react::PerformanceEntry& lhs, const facebook::react::PerformanceEntry& rhs) const;
 }
 
 struct facebook::react::PerformanceEventTiming : public facebook::react::AbstractPerformanceEntry {

diff --git a/scripts/cxx-api/api-snapshots/ReactAppleReleaseCxx.api b/scripts/cxx-api/api-snapshots/ReactAppleReleaseCxx.api
@@ -3349,6 +3349,7 @@ protocol RCTSafeAreaViewViewProtocol : public NSObject {
 }
 
 protocol RCTSchedulerDelegate {
+  public virtual BOOL schedulerShouldPromoteReactRevision:(facebook::react::SurfaceId surfaceId);
   public virtual void schedulerDidDispatchCommand:commandName:args:(const facebook::react::ShadowView& shadowView, const std::string& commandName, const folly::dynamic& args);
   public virtual void schedulerDidFinishTransaction:(std::shared_ptr<const facebook::react::MountingCoordinator> mountingCoordinator);
   public virtual void schedulerDidSendAccessibilityEvent:eventType:(const facebook::react::ShadowView& shadowView, const std::string& eventType);
@@ -7061,6 +7062,7 @@ class facebook::react::Scheduler : public facebook::react::UIManagerDelegate {
 }
 
 class facebook::react::SchedulerDelegate {
+  public virtual bool schedulerShouldPromoteReactRevision(facebook::react::SurfaceId surfaceId) = 0;
   public virtual void schedulerDidDispatchCommand(const facebook::react::ShadowView& shadowView, const std::string& commandName, const folly::dynamic& args) = 0;
   public virtual void schedulerDidFinishTransaction(const std::shared_ptr<const facebook::react::MountingCoordinator>& mountingCoordinator) = 0;
   public virtual void schedulerDidRequestPreliminaryViewAllocation(const facebook::react::ShadowNode& shadowNode) = 0;
@@ -9882,7 +9884,7 @@ struct facebook::react::NativePerformanceEntry {
 }
 
 struct facebook::react::PerformanceEntrySorter {
-  public bool operator()(const facebook::react::PerformanceEntry& lhs, const facebook::react::PerformanceEntry& rhs);
+  public bool operator()(const facebook::react::PerformanceEntry& lhs, const facebook::react::PerformanceEntry& rhs) const;
 }
 
 struct facebook::react::PerformanceEventTiming : public facebook::react::AbstractPerformanceEntry {

diff --git a/scripts/cxx-api/api-snapshots/ReactCommonDebugCxx.api b/scripts/cxx-api/api-snapshots/ReactCommonDebugCxx.api
@@ -3045,6 +3045,7 @@ class facebook::react::Scheduler : public facebook::react::UIManagerDelegate {
 }
 
 class facebook::react::SchedulerDelegate {
+  public virtual bool schedulerShouldPromoteReactRevision(facebook::react::SurfaceId surfaceId) = 0;
   public virtual void schedulerDidDispatchCommand(const facebook::react::ShadowView& shadowView, const std::string& commandName, const folly::dynamic& args) = 0;
   public virtual void schedulerDidFinishTransaction(const std::shared_ptr<const facebook::react::MountingCoordinator>& mountingCoordinator) = 0;
   public virtual void schedulerDidRequestPreliminaryViewAllocation(const facebook::react::ShadowNode& shadowNode) = 0;
@@ -5629,7 +5630,7 @@ struct facebook::react::NativePerformanceEntry {
 }
 
 struct facebook::react::PerformanceEntrySorter {
-  public bool operator()(const facebook::react::PerformanceEntry& lhs, const facebook::react::PerformanceEntry& rhs);
+  public bool operator()(const facebook::react::PerformanceEntry& lhs, const facebook::react::PerformanceEntry& rhs) const;
 }
 
 struct facebook::react::PerformanceEventTiming : public facebook::react::AbstractPerformanceEntry {

diff --git a/scripts/cxx-api/api-snapshots/ReactCommonReleaseCxx.api b/scripts/cxx-api/api-snapshots/ReactCommonReleaseCxx.api
@@ -3042,6 +3042,7 @@ class facebook::react::Scheduler : public facebook::react::UIManagerDelegate {
 }
 
 class facebook::react::SchedulerDelegate {
+  public virtual bool schedulerShouldPromoteReactRevision(facebook::react::SurfaceId surfaceId) = 0;
   public virtual void schedulerDidDispatchCommand(const facebook::react::ShadowView& shadowView, const std::string& commandName, const folly::dynamic& args) = 0;
   public virtual void schedulerDidFinishTransaction(const std::shared_ptr<const facebook::react::MountingCoordinator>& mountingCoordinator) = 0;
   public virtual void schedulerDidRequestPreliminaryViewAllocation(const facebook::react::ShadowNode& shadowNode) = 0;
@@ -5620,7 +5621,7 @@ struct facebook::react::NativePerformanceEntry {
 }
 
 struct facebook::react::PerformanceEntrySorter {
-  public bool operator()(const facebook::react::PerformanceEntry& lhs, const facebook::react::PerformanceEntry& rhs);
+  public bool operator()(const facebook::react::PerformanceEntry& lhs, const facebook::react::PerformanceEntry& rhs) const;
 }
 
 struct facebook::react::PerformanceEventTiming : public facebook::react::AbstractPerformanceEntry {